Electric heater.



2 SHEETS-SHEET 1.

PATENTED MAR. 24, 1908.

B. M. HEWLETT.

ELECTRIC HEATER.

APPLICATION-FILED AUG. 3, 1907.

INVENTEIR EDWARD PLHEWLETT.

13L ATTL WITNEiii A g. 716; w.

No. 882,564. PATENTED MAR. 24, 1908.-

E. HEWLETT.

ELECTRIC HEATER.

WHIIIIIIWII lllll Um;

EEEEEEEEEEEEEE H W H W I' i W M I UNITED STATES PATENT OFFICE.

EDWARD M. HEWLETT, OF'SCHENEOTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRIC HEATER.

Specification of Letters Patent.

Patented March 24, 1908.

To all whom it may concern:

Be it known that I, EDWARD M. HEWLETT, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Electric Heaters, of which the followin is a specification.

This invention re ates to resistance devices for electric circuits and has for its object the provision of a device of this character which is of a simple and durable construction and at the same time thoroughly reliable and efficient.

My invention relates more specifically to resistance devices for. use in electric heaters or the like, although certain phases of my invention are capab tion.

One of the objects of my invention is to provide an electric atmospheric heater or radiator, which isintended to be operated at a relatively lOW heat and can be brought up to its working temperature'in a comparatively short time.

Another object of my invention is to produce an electrical heater which may be constructed at a very low cost, the parts being almost entirely of sheet metal and the resistance elements themselves being punchings which may be easily assembled and durably constructed.

Other objects of my invention will appear in the course of the following specification in which I have set forth my invention in a specific form for purposes of illustration.

In the drawin s in which I have shown my invention embo ied in a concrete form, Figure 1 is a sectional elevation of one form of my invention; Fig. 2 is a transverse section of the same; Fig. 3 is a perspective view of the resistance unit; Fig. 4 is an elevationof a modified form of my invention; Fig. 5 is a side elevation of the same; Fig. 6 is a view of e of a wider applicathe disk aspunched; and 7 is 'a view of the completed disk.

. Referring to the drawings, 10 is a metallic casin shown circular in form and preferably close at the top by a plate 11 and provided With perforations 12. The bottom of the casing likewise has a plate in which are openings 13 to permit a circulation of air through the casing. Mounted in'the bottom of this casing is a supporting rod 14 secured to the bottom plate and extending about half way up the casing} Upon this rod and insulated therefrom are mounted a series of parallel resistance disks 15. These disks may be circular in form and are preferably punched or stamped from resistance metal such as sheet iron or the like. The form of these disks when first punched is shown in Fig 6, being a grid-shaped structure with a central opening The form of the punchin is such that it constitutes a strip extending iack and forth 'from the central opening 16 in radial lines so that the path through the metal will be in a zigzag form running in and out from the center. In order to stiffen the plate, the portions 17 and 18 are bent at right angles to the plane of the disk along the dotted lines shown in Fig. 6 so asto form stiflening webs although this may not always be found necessary. The disks are assembled on the rod 14 which passes through the opening 16, insu lating washers 19 being interposed between the. disks and an insulating sleeve 20 between the rod and the disks. The disks are then tightened down and the rod is held in place by means of the nuts 21. The arrangement whereby the connections are made between the successive disks is shown in Fig. 3 in' which it is seen that the edges of the disks are split at 22, and at the adjacent ends are bent, one up and one down, and fastened together,

as shown, so as to form a continuous path.

throughout the disks.

In the form shown in Fig. 1 the terminals 23 are secured to the bottom plate and from there connected to the disks.

In Figs. '4 and 5 I have shown a slightly modified form in which the casing 24 is rectangular in section and is curved at the upper end 25 in the sha e oi a hood so as to project the air through t e openings or perforations 26. In this form two resistance units 27 and 28 are employed and hooks 2.9 are arranged to permit of suspending the heater on the wall.

It will be seen that I have produced a very simple and efficient heater which .will come What I claim as new and desire to secure by Letters Patent of the United States, is

1. A resistance unit comprising a support, a plurality of disks mounted thereon, each consistin of a resistance strip extending back an forth from the support, and connections between said disks whereby a continuous path for the current is established throu hout the said disks.

2. resistance unit comprising a plurality of disks each consisting of a resistance strip extending back and forth from a common center, a central support therefor, and connections whereby a continuous path for the current-is established throughout the said disks.

3. A resistancaunit comprising a plurality of disks each consisting of a resistance strip extending back and forth from a common center and provided with stiffening webs, a central support therefor, and connections whereby a continuous path for the current is established throughout the said disks.

4. An electric heater comprising a casing having a plurality of grid-shaped resistance disks mounted in parallel arrangement thereon, and connections whereby a continuous path for the current is established throughout the said disks. 1

5. An electric heater comprising a casing, a support therein, a plurality of disks each consisting of a resistance strip mounted upon said support and extending back and forth therefrom, and connections whereby a continuous path for the current is established throughout the said disks.

6. An electric heater comprising a closed casing, aresistance unit arranged to occupy a portion of said closure, said unit consisting of a plurality of spaced grid-shaped disks, and connections whereby a continuous path for the current is established throughout the said disks.

7. An electric heater comprising a casing, a support therein, a plurality of disks mounted in parallel arrangement upon said support, each consisting of a resistance strip extending towards and from said support in radial lines, and connections whereby a continuous path for the current is established throughout the said disks.

8. An electric heater comprising a casing, a sup {porting rod therein, a plurality of parallel isks spaced from each other and mountedon but insulated from the said rod, said disks each' consisting of a resistance strip extending back and forth from the rod as a center and rovided with stiffening webs, and connections whereby a continuous path for the current is established throughout the said disks.

In witness whereof, I have hereunto set my hand this 26th day of July, 1907.

EDWARD M. HEWLETT.

Witnesses:

BENJAMIN B. HULL,' HELEN ORFORD. 

